CRUSTACEA CASPIA. 305 



the 1st, flagellum not nearly attaining the length of the peduncle. Inferior 

 antennae in botif sexes very strongly built, though, as usual, somewhat 

 larger in male than in female; penultimate joint of the peduncle large 

 and tumid, being produced at the end posteriorly to a moderately long and 

 but slightly curved spiniform projection, at the base of which, as in C. 

 curvispinum, there is a short bilobular expansion; last peduncular joint 

 much shorter than the penultimate one, and having somewhat above the 

 middle posteriorly a short recurved prominence, end of the joint produced 

 to a strong spiniform process; flagellum shorter than the last peduncular 

 joint. The 2 anterior pairs of pereiupoda resemble those in C carvi- 

 spiimm, though they are somewhat more elongated; meral joint rather much 

 expanded and densely setiferous anteriorly. Last pair of pereiopoda com- 

 paratively more elongated than in C. curvispinum, exceeding half the length 

 of the body. Uropoda and telson nearly as in that species. Length of adult 

 female 7 mm., of male 8 mm. 



Remarks. — This species is nearly allied to the preceding one, though 

 easily distinguishable by the more robust form of the body and by the 

 structure of the 2 pairs of antennai, the inferior of which are in both sexes 

 very coarsely built, and have the last peduncular joint, as in C. chelicorne, 

 produced to a spiniform process. 



Description. — The length of adult, ovigerous females is about 7 mm., 

 that of males 8 mm., and this form is accordingly somewhat larger than C. 

 curvispinum, or about the size of G. chelicorne. 



The form of the body (see fig. 10) is rather robust, witii broad, flattened 

 back. 



The cephalou has the frontal edge but very slightly produced in tlie 

 middle, forming an obtuse angle. The lateral lobes are moderately prominent 

 and narrowly rounded at the tip. 



The coxal and epimeral plates do not exhibit any difference from those 

 in the 2 preceding spines. 



The urosome (fig. 1 5) likewise agrees with that of the said species in 

 having the last 2 segments less distinctly marked off from each other. 



The eyes are small, but distinct, with dark pigment. 



Tlie superior antenna are in the female comparatively short, not attain- 

 ing Vs oi the length of the body, and have the 1st joint of tlie peduncle 

 armed below with 3 distant spiuules. In the male these antenna (fig. 1 1 ) 

 are, as usual, more fully developed, though not nearly so much elongated 

 as in the male of G. curvispinum, and as in the latter, have the peduncle 

 densely clothed with slender bristles. The 2nd joint is somewhat longer in 

 the male than in the female, but in both sexes it is considerably shorter 



«i>U3.-MaT. CTp. 213, ^l 



